<!DOCTYPE html>
<!--
@license
Copyright (C) 2016 The Android Open Source Project

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->

<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<title>gr-cursor-manager</title>

<script src="/bower_components/webcomponentsjs/custom-elements-es5-adapter.js"></script>

<script src="/bower_components/webcomponentsjs/webcomponents-lite.js"></script>
<script src="/bower_components/web-component-tester/browser.js"></script>
<link rel="import" href="../../../test/common-test-setup.html"/>
<link rel="import" href="gr-cursor-manager.html">

<script>void(0);</script>

<test-fixture id="basic">
  <template>
    <gr-cursor-manager cursor-target-class="targeted"></gr-cursor-manager>
    <ul>
      <li>A</li>
      <li>B</li>
      <li>C</li>
      <li>D</li>
    </ul>
  </template>
</test-fixture>

<script>
  suite('gr-cursor-manager tests', () => {
    let sandbox;
    let element;
    let list;

    setup(() => {
      sandbox = sinon.sandbox.create();
      const fixtureElements = fixture('basic');
      element = fixtureElements[0];
      list = fixtureElements[1];
    });

    teardown(() => {
      sandbox.restore();
    });

    test('core cursor functionality', () => {
      // The element is initialized into the proper state.
      assert.isArray(element.stops);
      assert.equal(element.stops.length, 0);
      assert.equal(element.index, -1);
      assert.isNotOk(element.target);

      // Initialize the cursor with its stops.
      element.stops = list.querySelectorAll('li');

      // It should have the stops but it should not be targeting any of them.
      assert.isNotNull(element.stops);
      assert.equal(element.stops.length, 4);
      assert.equal(element.index, -1);
      assert.isNotOk(element.target);

      // Select the third stop.
      element.setCursor(list.children[2]);

      // It should update its internal state and update the element's class.
      assert.equal(element.index, 2);
      assert.equal(element.target, list.children[2]);
      assert.isTrue(list.children[2].classList.contains('targeted'));
      assert.isFalse(element.isAtStart());
      assert.isFalse(element.isAtEnd());

      // Progress the cursor.
      element.next();

      // Confirm that the next stop is selected and that the previous stop is
      // unselected.
      assert.equal(element.index, 3);
      assert.equal(element.target, list.children[3]);
      assert.isTrue(element.isAtEnd());
      assert.isFalse(list.children[2].classList.contains('targeted'));
      assert.isTrue(list.children[3].classList.contains('targeted'));

      // Progress the cursor.
      element.next();

      // We should still be at the end.
      assert.equal(element.index, 3);
      assert.equal(element.target, list.children[3]);
      assert.isTrue(element.isAtEnd());

      // Wind the cursor all the way back to the first stop.
      element.previous();
      element.previous();
      element.previous();

      // The element state should reflect the end of the list.
      assert.equal(element.index, 0);
      assert.equal(element.target, list.children[0]);
      assert.isTrue(element.isAtStart());
      assert.isTrue(list.children[0].classList.contains('targeted'));

      const newLi = document.createElement('li');
      newLi.textContent = 'Z';
      list.insertBefore(newLi, list.children[0]);
      element.stops = list.querySelectorAll('li');

      assert.equal(element.index, 1);

      // De-select all targets.
      element.unsetCursor();

      // There should now be no cursor target.
      assert.isFalse(list.children[1].classList.contains('targeted'));
      assert.isNotOk(element.target);
      assert.equal(element.index, -1);
    });

    test('_moveCursor', () => {
      // Initialize the cursor with its stops.
      element.stops = list.querySelectorAll('li');
      // Select the first stop.
      element.setCursor(list.children[0]);
      const getTargetHeight = sinon.stub();

      // Move the cursor without an optional get target height function.
      element._moveCursor(1);
      assert.isFalse(getTargetHeight.called);

      // Move the cursor with an optional get target height function.
      element._moveCursor(1, null, getTargetHeight);
      assert.isTrue(getTargetHeight.called);
    });

    test('_moveCursor from -1 does not check height', () => {
      element.stops = list.querySelectorAll('li');
      const getTargetHeight = sinon.stub();
      element._moveCursor(1, () => false, getTargetHeight);
      assert.isFalse(getTargetHeight.called);
    });

    test('opt_noScroll', () => {
      sandbox.stub(element, '_targetIsVisible', () => false);
      const scrollStub = sandbox.stub(window, 'scrollTo');
      element.stops = list.querySelectorAll('li');
      element.scrollBehavior = 'keep-visible';

      element.setCursorAtIndex(1, true);
      assert.isFalse(scrollStub.called);

      element.setCursorAtIndex(2);
      assert.isTrue(scrollStub.called);
    });

    test('_getNextindex', () => {
      const isLetterB = function(row) {
        return row.textContent === 'B';
      };
      element.stops = list.querySelectorAll('li');
      // Start cursor at the first stop.
      element.setCursor(list.children[0]);

      // Move forward to meet the next condition.
      assert.equal(element._getNextindex(1, isLetterB), 1);
      element.index = 1;

      // Nothing else meets the condition, should be at last stop.
      assert.equal(element._getNextindex(1, isLetterB), 3);
      element.index = 3;

      // Should stay at last stop if try to proceed.
      assert.equal(element._getNextindex(1, isLetterB), 3);

      // Go back to the previous condition met. Should be back at.
      // stop 1.
      assert.equal(element._getNextindex(-1, isLetterB), 1);
      element.index = 1;

      // Go back. No more meet the condition. Should be at stop 0.
      assert.equal(element._getNextindex(-1, isLetterB), 0);
    });

    test('focusOnMove prop', () => {
      const listEls = list.querySelectorAll('li');
      for (let i = 0; i < listEls.length; i++) {
        sandbox.spy(listEls[i], 'focus');
      }
      element.stops = listEls;
      element.setCursor(list.children[0]);

      element.focusOnMove = false;
      element.next();
      assert.isFalse(element.target.focus.called);

      element.focusOnMove = true;
      element.next();
      assert.isTrue(element.target.focus.called);
    });

    suite('_scrollToTarget', () => {
      let scrollStub;
      setup(() => {
        element.stops = list.querySelectorAll('li');
        element.scrollBehavior = 'keep-visible';

        // There is a target which has a targetNext
        element.setCursor(list.children[0]);
        element._moveCursor(1);
        scrollStub = sandbox.stub(window, 'scrollTo');
        window.innerHeight = 60;
      });

      test('Called when top and bottom not visible', () => {
        sandbox.stub(element, '_targetIsVisible').returns(false);
        element._scrollToTarget();
        assert.isTrue(scrollStub.called);
      });

      test('Not called when top and bottom visible', () => {
        sandbox.stub(element, '_targetIsVisible').returns(true);
        element._scrollToTarget();
        assert.isFalse(scrollStub.called);
      });

      test('Called when top is visible, bottom is not, scroll is lower', () => {
        const visibleStub = sandbox.stub(element, '_targetIsVisible',
            () => visibleStub.callCount === 2);
        sandbox.stub(element, '_getWindowDims').returns({
          scrollX: 123,
          scrollY: 15,
          innerHeight: 1000,
          pageYOffset: 0,
        });
        sandbox.stub(element, '_calculateScrollToValue').returns(20);
        element._scrollToTarget();
        assert.isTrue(scrollStub.called);
        assert.isTrue(scrollStub.calledWithExactly(123, 20));
        assert.equal(visibleStub.callCount, 2);
      });

      test('Called when top is visible, bottom not, scroll is higher', () => {
        const visibleStub = sandbox.stub(element, '_targetIsVisible',
            () => visibleStub.callCount === 2);
        sandbox.stub(element, '_getWindowDims').returns({
          scrollX: 123,
          scrollY: 25,
          innerHeight: 1000,
          pageYOffset: 0,
        });
        sandbox.stub(element, '_calculateScrollToValue').returns(20);
        element._scrollToTarget();
        assert.isFalse(scrollStub.called);
        assert.equal(visibleStub.callCount, 2);
      });

      test('_calculateScrollToValue', () => {
        sandbox.stub(element, '_getWindowDims').returns({
          scrollX: 123,
          scrollY: 25,
          innerHeight: 300,
          pageYOffset: 0,
        });
        assert.equal(element._calculateScrollToValue(1000, {offsetHeight: 10}),
            905);
      });
    });
  });
</script>
